問題詳情

       A cataract is a dense, cloudy area that forms in the lens of the eye, which leads to a decrease in vision. Cataracts often develop slowly andcan affect one or both eyes. They begin when proteins in the eye form clumps that   27   the lens from sending clear images to the retina at theback of the eye. Cataracts are most commonly   28   aging but may also be caused by trauma or radiation exposure, be present from birth, oroccur following eye surgery for other problems.
       Symptoms of a cataract may include blurry or double vision and trouble with bright lights, and trouble seeing at night. This may result introuble driving, reading, or recognizing faces, and in   29   cases, even an increased risk of falling and depression.   30   , cataracts cause halfof all cases of blindness and 33% of visual impairment worldwide. Their prevention includes wearing sunglasses, a wide brimmed hat, eating leafyvegetables and fruits, and avoiding smoking.   31   the symptoms may be improved with glasses. If this does not help, surgery to remove thecloudy lens and replace it with an artificial lens is the only effective treatment.
27.
(A) depart
(B) prevent
(C) release
(D) transfer

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